// 复习react 手撕React官网dome

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';

function Square(props) {
  return (
    <button className="square"
      onClick={props.onClick} >
      {props.value}
    </button>
  );
}

class Board extends React.Component {
  renderSquare(i) {
    return <Square value={this.props.squares[i]}
      onClick={()=>this.props.handleClick(i)}/>
  }
  render() {
    return (
      <div>
        <div className="board-row">
          {this.renderSquare(0)}
          {this.renderSquare(1)}
          {this.renderSquare(2)}
        </div>
        <div className="board-row">
          {this.renderSquare(3)}
          {this.renderSquare(4)}
          {this.renderSquare(5)}
        </div>
        <div className="board-row">
          {this.renderSquare(6)}
          {this.renderSquare(7)}
          {this.renderSquare(8)}
        </div>
      </div>
    );
  }
}

class Game extends React.Component {
  constructor(props){
    super(props);
    this.state = {
      history:[{
        squares:Array(9).fill(null),
      }],
      xInNext:true,
      stepNumber:0,
    };
  }

  handleClick(i) {
    const history =
     this.state.history.slice(0,this.state.stepNumber + 1);
    const current = history[history.length-1];
    const squares = current.squares.slice();

    if(calculateWinner(squares) || squares[i]){
      return;
    }
    squares[i] = this.state.xInNext ? 'X':'O';
    this.setState({
      history:history.concat([{
        squares:squares,
      }]),
      stepNumber:history.length,
      xInNext:!this.state.xInNext,
    })
  }

  jumpTo(step){
    this.setState({
      stepNumber:step,
      xIsNext:(step % 2) === 0,
    });
  };

  render() {
    const history = this.state.history;
    const current = history[this.state.stepNumber];
    const winner = calculateWinner(current.squares);
    const moves = history.map((step,move)=>{
      console.log('step',step);
      console.log('move',move);
      const desc = move? '阿巴巴巴#'+move:'开始游戏';
      return(
        <li key={move} >
          <button onClick={()=> this.jumpTo(move)} >{desc}</button>
        </li>
      );
    });

    let status;
    if (winner) {
      status = 'Winner: ' + winner;
    } else {
      status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
    }

    return (
      <div className="game">
        <div className="game-board">
          <Board squares={current.squares}
          onClick={(i)=>this.handleClick(i)} />
        </div>
        <div className="game-info">
          <div>{status}</div>
          <ol>{moves}</ol>
        </div>
      </div>
    );
  }
}


// ========================================

ReactDOM.render(
  <Game />,
  document.getElementById('root')
);

function calculateWinner(squares) {
  const lines = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6],
  ];
  for (let i = 0; i < lines.length; i++) {
    const [a, b, c] = lines[i];
    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
      return squares[a];
    }
  }
  return null;
}